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AS101 (238)
Lecture

# October 13.docx

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Department
Astronomy
Course
AS101
Professor
Shohini Ghose
Semester
Fall

Description
October 13, 2011  Motion: o Where is something and when is it there o Position is measured relative to a coordinate system  Speed: o Rate at which an object moves o Velocity: Speed and direction o Use SI units (m/s) unless otherwise asked  Acceleration: o The rate of change of velocity with time – change of velocity/time o Since velocity has a direction, acceleration also has a direction  The acceleration of Gravity: o All falling objects have constant acceleration downwards (not counting friction of air resistance) o On Earth acceleration of gravity, g=10 m/s . Speed increases 10m/s with each second of falling  Momentum: o Mass x velocity o Since velocity has direction, momentum has direction o Newton discovered a relationship between force and momentum  Force: o A push or pull that acts on an object o A f
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